Commit 23de91e9 authored by Robert Baldyga's avatar Robert Baldyga Committed by Felipe Balbi

usb: gadget: f_fs: add poll for endpoint 0

This patch adds poll function for file representing ep0.

Ability of read from or write to ep0 file is related with actual state of ffs:
- When desctiptors or strings are not written yet, POLLOUT flag is set.
- If there is any event to read, POLLIN flag is set.
- If setup request was read, POLLIN and POLLOUT flag is set, to allow
  send response (by performing I/O operation consistent with setup request
  direction) or set stall (by performing I/O operation opposite  setup
  request direction).
Signed-off-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 0a7b1f8a
......@@ -28,6 +28,8 @@
#include <linux/usb/composite.h>
#include <linux/usb/functionfs.h>
#include <linux/poll.h>
#include "u_fs.h"
#include "configfs.h"
......@@ -570,6 +572,45 @@ static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value)
return ret;
}
static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait)
{
struct ffs_data *ffs = file->private_data;
unsigned int mask = POLLWRNORM;
int ret;
poll_wait(file, &ffs->ev.waitq, wait);
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
if (unlikely(ret < 0))
return mask;
switch (ffs->state) {
case FFS_READ_DESCRIPTORS:
case FFS_READ_STRINGS:
mask |= POLLOUT;
break;
case FFS_ACTIVE:
switch (ffs->setup_state) {
case FFS_NO_SETUP:
if (ffs->ev.count)
mask |= POLLIN;
break;
case FFS_SETUP_PENDING:
case FFS_SETUP_CANCELLED:
mask |= (POLLIN | POLLOUT);
break;
}
case FFS_CLOSING:
break;
}
mutex_unlock(&ffs->mutex);
return mask;
}
static const struct file_operations ffs_ep0_operations = {
.llseek = no_llseek,
......@@ -578,6 +619,7 @@ static const struct file_operations ffs_ep0_operations = {
.read = ffs_ep0_read,
.release = ffs_ep0_release,
.unlocked_ioctl = ffs_ep0_ioctl,
.poll = ffs_ep0_poll,
};
......
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